Method: 1. Heat water in a pan over medium flame. 2. Add the ginger annd cover the pan with a lid. 3. Remove the pan from the flame and keep aside for 10 minutes. 4. Strain this into a jar. 5. Cover and keep it in the fridge for 2 to 4 hours. 6. Mix the lemon juice and sugar in a pitcher. 7. Stir until sugar has fully dissolved. 8. Add the cold water and mix well. 9. To serve, fill serving glasses with ice cubes. 10. Pour equal amounts of the ginger syrup and lemonade. 11. Stir well and garnish with a lemon slice. 12. Add some more sugar if desired. 13. Serve chill.